diff --git a/server.go b/server.go
index 5cc8bf2..b181398 100644
--- a/server.go
+++ b/server.go
@@ -28,12 +28,12 @@ func NewServer(c *Config) *Server {
 		PreferGo: true,
 		Dial: func(ctx context.Context, network, addr string) (net.Conn, error) {
 			d := net.Dialer{Timeout: c.Timeout}
-			if c.DNS != "" {
-				addr = c.DNS
-			}
-			return d.DialContext(ctx, network, addr)
+			return d.DialContext(ctx, network, c.DNS)
 		},
 	}
+	if c.DNS == "" {
+		resolver = &net.Resolver{}
+	}
 	transport := &http.Transport{}
 	transport.TLSClientConfig = &tls.Config{
 		InsecureSkipVerify: c.TLSInsecure,